You left out the space between 'int' and 'x^2'. I added it.

Use "integration by parts": with , so that , . Doing that, you will still have an integral involving . So use integration by partsagain, this time letting , .

Generally speaking, any time you have an integral of , you can consider repeated integration by parts, repeatedly taking the power of x as "u" so that when you differentiate to get du, you have one less power of x. Repeat until you have reduced the power of x to 0.

The result is :

Many thanks!!!